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Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
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https://access.redhat.com/errata/RHSA-2018:3062
Reproduce： Version-Release number of selected component (if applicable): Host: kernel: 3.10.0-862.9.1.el7.ppc64le qemu-kvm-rhev-2.10.0-21.el7_5.4.ppc64le SLOF-20170724-2.git89f519f.el7.noarch Guest kernel: kernel: 3.10.0-862.9.1.el7.ppc64le How reproducible: 100% Steps to Reproduce: 1. Define one vm and boot up it, for example: /usr/libexec/qemu-kvm \ -name 'avocado-vt-vm1' \ -sandbox off \ -machine pseries \ -nodefaults \ -vga std \ -chardev socket,id=qmp_id_catch_monitor,path=/var/tmp/monitor-catch_monitor0,server,nowait \ -mon chardev=qmp_id_catch_monitor,mode=control \ -chardev socket,id=serial_id_serial0,path=/var/tmp/serial-serial0,server,nowait \ -device spapr-vty,reg=0x30000000,chardev=serial_id_serial0 \ -device nec-usb-xhci,id=usb1,bus=pci.0,addr=0x3 \ -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pci.0,addr=0x4 \ -drive id=drive_image1,if=none,snapshot=off,aio=threads,cache=none,format=qcow2,file=/home/RHEL-7.5-20180322.0.qcow2 \ -device scsi-hd,id=image1,drive=drive_image1 \ -device virtio-net-pci,mac=9a:4a:4b:4c:4d:4e,id=net0,netdev=tap0,bus=pci.0,addr=0x5,vectors=514,mq=on \ -netdev tap,id=tap0,vhost=on \ -m 8G \ -smp 8,cores=4,threads=2,sockets=1 \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -device usb-kbd,id=usb-kbd1,bus=usb1.0,port=2 \ -vnc :1 \ -rtc base=utc,clock=host \ -boot menu=off,strict=off,order=cdn,once=c \ -enable-kvm \ -qmp tcp:0:6666,server,nowait \ -monitor stdio \ 2. [root@ibm-p8-rhevm-08 home]# sh test.sh QEMU 2.10.0 monitor - type 'help' for more information (qemu) systemctl stop kdump unknown command: 'systemctl' (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test1 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test2 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test3 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test3 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test4 dump: failed to save memory 3. Check the crash coredump file is automatically created on Host: [root@ibm-p8-rhevm-08 dump]# ls -lh /var/lib/libvirt/qemu/dump/ total 46G -rw------- 1 root root 7.6G Jul 3 03:23 guest -r-------- 1 root root 8.1G Jul 3 04:31 test -r-------- 1 root root 8.1G Jul 3 04:32 test1 -r-------- 1 root root 8.1G Jul 3 04:34 test2 -r-------- 1 root root 8.1G Jul 3 04:37 test3 -r-------- 1 root root 6.0G Jul 3 04:48 test4 [root@ibm-p8-rhevm-08 dump]# df -h /var/lib/libvirt/qemu/dump/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel_ibm--p8--rhevm--08-root 50G 50G 650M 99% / the result as 2:the error message is not explicit Steps to verify: change host qemu-kvm-rhel version to: qemu-kvm-rhev-2.12.0-6.el7.ppc64le.rpm 1.boot the vm 2.[root@ibm-p8-rhevm-08 home]# sh test.sh QEMU 2.12.0 monitor - type 'help' for more information (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test1 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test2 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test2 (qemu) (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test3 (qemu) dump-guest-memory /var/lib/libvirt/qemu/dump/test4 dump: failed to save memory: No space left on device (qemu) 3. [root@ibm-p8-rhevm-08 home]# df -h /var/lib/libvirt/qemu/dump/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel_ibm--p8--rhevm--08-root 50G 50G 64K 100% / [root@ibm-p8-rhevm-08 home]# ls -lh /var/lib/libvirt/qemu/dump/ total 48G -rw------- 1 root root 7.6G Jul 3 03:23 guest -r-------- 1 root root 8.1G Jul 3 05:27 test -r-------- 1 root root 8.1G Jul 3 05:28 test1 -r-------- 1 root root 8.1G Jul 3 21:48 test2 -r-------- 1 root root 8.1G Jul 3 21:52 test3 -r-------- 1 root root 7.6G Jul 3 21:54 test4 the result as 2:the error message is explicit（No space left on device）.